Hm, well pretty much all you need for a Hail Team is just the setup (Abomasnow in this case) and other mons that have abilities that go well in the Hail/have Ice types (ex: Frolass w/ Snow Cloak and Walrein w/ Ice Body).
The mons are currently implemented that have abilties that benefit in the Hail/can be fine in it would be the Seel line, Snorunt Line, Swinub line, Spheal line, Vanillite Line, Cubchoo line, Smoochum line, Delibird, Amura line, and Bergmite line. You can still have other Pokemon types in your team, but it seems annoying for your own team members to be losing health
Anyways, I would recommend Abomasnow, Mamoswine, Bergmite, Walrein, Aurorus, and perhaps Frosslass/Glalie.